/*
 *  RFC 1321 compliant MD5 implementation
 *
 *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
 *  SPDX-License-Identifier: GPL-2.0
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 *  This file is part of mbed TLS (https://tls.mbed.org)
 */
/*
 *  The MD5 algorithm was designed by Ron Rivest in 1991.
 *
 *  http://www.ietf.org/rfc/rfc1321.txt
 */

#include "md5.h"
#include "utils.h"

#include <string.h>

#if !defined(MBEDTLS_MD5_ALT)

/*
 * 32-bit integer manipulation macros (little endian)
 */
#ifndef GET_UINT32_LE
#define GET_UINT32_LE(n, b, i)                                                                                                                                                            \
	{                                                                                                                                                                                     \
		(n) = (static_cast<uint32_t>((b)[(i)])) | (static_cast<uint32_t>((b)[(i) + 1]) << 8) | (static_cast<uint32_t>((b)[(i) + 2]) << 16) | (static_cast<uint32_t>((b)[(i) + 3]) << 24); \
	}
#endif

#ifndef PUT_UINT32_LE
#define PUT_UINT32_LE(n, b, i)                                         \
	{                                                                  \
		(b)[(i)] = static_cast<unsigned char>(((n)) & 0xFF);           \
		(b)[(i) + 1] = static_cast<unsigned char>(((n) >> 8) & 0xFF);  \
		(b)[(i) + 2] = static_cast<unsigned char>(((n) >> 16) & 0xFF); \
		(b)[(i) + 3] = static_cast<unsigned char>(((n) >> 24) & 0xFF); \
	}
#endif

void mbedtls_md5_init(mbedtls_md5_context* ctx)
{
	memset(ctx, 0, sizeof(mbedtls_md5_context));
}

void mbedtls_md5_free(mbedtls_md5_context* ctx)
{
	if (ctx == NULL)
		return;

	mbedtls_zeroize(ctx, sizeof(mbedtls_md5_context));
}

void mbedtls_md5_clone(mbedtls_md5_context* dst,
	const mbedtls_md5_context* src)
{
	*dst = *src;
}

/*
 * MD5 context setup
 */
int mbedtls_md5_starts_ret(mbedtls_md5_context* ctx)
{
	ctx->total[0] = 0;
	ctx->total[1] = 0;

	ctx->state[0] = 0x67452301;
	ctx->state[1] = 0xEFCDAB89;
	ctx->state[2] = 0x98BADCFE;
	ctx->state[3] = 0x10325476;

	return (0);
}

#if !defined(MBEDTLS_DEPRECATED_REMOVED)
void mbedtls_md5_starts(mbedtls_md5_context* ctx)
{
	mbedtls_md5_starts_ret(ctx);
}
#endif

#if !defined(MBEDTLS_MD5_PROCESS_ALT)
int mbedtls_internal_md5_process(mbedtls_md5_context* ctx,
	const unsigned char data[64])
{
	uint32_t X[16], A, B, C, D;

	GET_UINT32_LE(X[0], data, 0);
	GET_UINT32_LE(X[1], data, 4);
	GET_UINT32_LE(X[2], data, 8);
	GET_UINT32_LE(X[3], data, 12);
	GET_UINT32_LE(X[4], data, 16);
	GET_UINT32_LE(X[5], data, 20);
	GET_UINT32_LE(X[6], data, 24);
	GET_UINT32_LE(X[7], data, 28);
	GET_UINT32_LE(X[8], data, 32);
	GET_UINT32_LE(X[9], data, 36);
	GET_UINT32_LE(X[10], data, 40);
	GET_UINT32_LE(X[11], data, 44);
	GET_UINT32_LE(X[12], data, 48);
	GET_UINT32_LE(X[13], data, 52);
	GET_UINT32_LE(X[14], data, 56);
	GET_UINT32_LE(X[15], data, 60);

#define S(x, n) ((x << n) | ((x & 0xFFFFFFFF) >> (32 - n)))

#define P(a, b, c, d, k, s, t)      \
	{                               \
		a += F(b, c, d) + X[k] + t; \
		a = S(a, s) + b;            \
	}

	A = ctx->state[0];
	B = ctx->state[1];
	C = ctx->state[2];
	D = ctx->state[3];

#define F(x, y, z) (z ^ (x & (y ^ z)))

	P(A, B, C, D, 0, 7, 0xD76AA478);
	P(D, A, B, C, 1, 12, 0xE8C7B756);
	P(C, D, A, B, 2, 17, 0x242070DB);
	P(B, C, D, A, 3, 22, 0xC1BDCEEE);
	P(A, B, C, D, 4, 7, 0xF57C0FAF);
	P(D, A, B, C, 5, 12, 0x4787C62A);
	P(C, D, A, B, 6, 17, 0xA8304613);
	P(B, C, D, A, 7, 22, 0xFD469501);
	P(A, B, C, D, 8, 7, 0x698098D8);
	P(D, A, B, C, 9, 12, 0x8B44F7AF);
	P(C, D, A, B, 10, 17, 0xFFFF5BB1);
	P(B, C, D, A, 11, 22, 0x895CD7BE);
	P(A, B, C, D, 12, 7, 0x6B901122);
	P(D, A, B, C, 13, 12, 0xFD987193);
	P(C, D, A, B, 14, 17, 0xA679438E);
	P(B, C, D, A, 15, 22, 0x49B40821);

#undef F

#define F(x, y, z) (y ^ (z & (x ^ y)))

	P(A, B, C, D, 1, 5, 0xF61E2562);
	P(D, A, B, C, 6, 9, 0xC040B340);
	P(C, D, A, B, 11, 14, 0x265E5A51);
	P(B, C, D, A, 0, 20, 0xE9B6C7AA);
	P(A, B, C, D, 5, 5, 0xD62F105D);
	P(D, A, B, C, 10, 9, 0x02441453);
	P(C, D, A, B, 15, 14, 0xD8A1E681);
	P(B, C, D, A, 4, 20, 0xE7D3FBC8);
	P(A, B, C, D, 9, 5, 0x21E1CDE6);
	P(D, A, B, C, 14, 9, 0xC33707D6);
	P(C, D, A, B, 3, 14, 0xF4D50D87);
	P(B, C, D, A, 8, 20, 0x455A14ED);
	P(A, B, C, D, 13, 5, 0xA9E3E905);
	P(D, A, B, C, 2, 9, 0xFCEFA3F8);
	P(C, D, A, B, 7, 14, 0x676F02D9);
	P(B, C, D, A, 12, 20, 0x8D2A4C8A);

#undef F

#define F(x, y, z) (x ^ y ^ z)

	P(A, B, C, D, 5, 4, 0xFFFA3942);
	P(D, A, B, C, 8, 11, 0x8771F681);
	P(C, D, A, B, 11, 16, 0x6D9D6122);
	P(B, C, D, A, 14, 23, 0xFDE5380C);
	P(A, B, C, D, 1, 4, 0xA4BEEA44);
	P(D, A, B, C, 4, 11, 0x4BDECFA9);
	P(C, D, A, B, 7, 16, 0xF6BB4B60);
	P(B, C, D, A, 10, 23, 0xBEBFBC70);
	P(A, B, C, D, 13, 4, 0x289B7EC6);
	P(D, A, B, C, 0, 11, 0xEAA127FA);
	P(C, D, A, B, 3, 16, 0xD4EF3085);
	P(B, C, D, A, 6, 23, 0x04881D05);
	P(A, B, C, D, 9, 4, 0xD9D4D039);
	P(D, A, B, C, 12, 11, 0xE6DB99E5);
	P(C, D, A, B, 15, 16, 0x1FA27CF8);
	P(B, C, D, A, 2, 23, 0xC4AC5665);

#undef F

#define F(x, y, z) (y ^ (x | ~z))

	P(A, B, C, D, 0, 6, 0xF4292244);
	P(D, A, B, C, 7, 10, 0x432AFF97);
	P(C, D, A, B, 14, 15, 0xAB9423A7);
	P(B, C, D, A, 5, 21, 0xFC93A039);
	P(A, B, C, D, 12, 6, 0x655B59C3);
	P(D, A, B, C, 3, 10, 0x8F0CCC92);
	P(C, D, A, B, 10, 15, 0xFFEFF47D);
	P(B, C, D, A, 1, 21, 0x85845DD1);
	P(A, B, C, D, 8, 6, 0x6FA87E4F);
	P(D, A, B, C, 15, 10, 0xFE2CE6E0);
	P(C, D, A, B, 6, 15, 0xA3014314);
	P(B, C, D, A, 13, 21, 0x4E0811A1);
	P(A, B, C, D, 4, 6, 0xF7537E82);
	P(D, A, B, C, 11, 10, 0xBD3AF235);
	P(C, D, A, B, 2, 15, 0x2AD7D2BB);
	P(B, C, D, A, 9, 21, 0xEB86D391);

#undef F

	ctx->state[0] += A;
	ctx->state[1] += B;
	ctx->state[2] += C;
	ctx->state[3] += D;

	return (0);
}

#if !defined(MBEDTLS_DEPRECATED_REMOVED)
void mbedtls_md5_process(mbedtls_md5_context* ctx,
	const unsigned char data[64])
{
	mbedtls_internal_md5_process(ctx, data);
}
#endif
#endif /* !MBEDTLS_MD5_PROCESS_ALT */

/*
 * MD5 process buffer
 */
int mbedtls_md5_update_ret(mbedtls_md5_context* ctx,
	const unsigned char* input,
	size_t ilen)
{
	int ret;
	size_t fill;
	uint32_t left;

	if (ilen == 0)
		return (0);

	left = ctx->total[0] & 0x3F;
	fill = 64 - left;

	ctx->total[0] += static_cast<uint32_t>(ilen);
	ctx->total[0] &= 0xFFFFFFFF;

	if (ctx->total[0] < static_cast<uint32_t>(ilen))
		ctx->total[1]++;

	if (left && ilen >= fill)
	{
		memcpy(ctx->buffer + left, input, fill);
		if ((ret = mbedtls_internal_md5_process(ctx, ctx->buffer)) != 0)
			return (ret);

		input += fill;
		ilen -= fill;
		left = 0;
	}

	while (ilen >= 64)
	{
		if ((ret = mbedtls_internal_md5_process(ctx, input)) != 0)
			return (ret);

		input += 64;
		ilen -= 64;
	}

	if (ilen > 0)
	{
		memcpy(ctx->buffer + left, input, ilen);
	}

	return (0);
}

#if !defined(MBEDTLS_DEPRECATED_REMOVED)
void mbedtls_md5_update(mbedtls_md5_context* ctx,
	const unsigned char* input,
	size_t ilen)
{
	mbedtls_md5_update_ret(ctx, input, ilen);
}
#endif

/*
 * MD5 final digest
 */
int mbedtls_md5_finish_ret(mbedtls_md5_context* ctx,
	unsigned char output[16])
{
	int ret;
	uint32_t used;
	uint32_t high, low;

	/*
	 * Add padding: 0x80 then 0x00 until 8 bytes remain for the length
	 */
	used = ctx->total[0] & 0x3F;

	ctx->buffer[used++] = 0x80;

	if (used <= 56)
	{
		/* Enough room for padding + length in current block */
		memset(ctx->buffer + used, 0, 56 - used);
	}
	else
	{
		/* We'll need an extra block */
		memset(ctx->buffer + used, 0, 64 - used);

		if ((ret = mbedtls_internal_md5_process(ctx, ctx->buffer)) != 0)
			return (ret);

		memset(ctx->buffer, 0, 56);
	}

	/*
	 * Add message length
	 */
	high = (ctx->total[0] >> 29) | (ctx->total[1] << 3);
	low = (ctx->total[0] << 3);

	PUT_UINT32_LE(low, ctx->buffer, 56);
	PUT_UINT32_LE(high, ctx->buffer, 60);

	if ((ret = mbedtls_internal_md5_process(ctx, ctx->buffer)) != 0)
		return (ret);

	/*
	 * Output final state
	 */
	PUT_UINT32_LE(ctx->state[0], output, 0);
	PUT_UINT32_LE(ctx->state[1], output, 4);
	PUT_UINT32_LE(ctx->state[2], output, 8);
	PUT_UINT32_LE(ctx->state[3], output, 12);

	return (0);
}

#if !defined(MBEDTLS_DEPRECATED_REMOVED)
void mbedtls_md5_finish(mbedtls_md5_context* ctx,
	unsigned char output[16])
{
	mbedtls_md5_finish_ret(ctx, output);
}
#endif

#endif /* !MBEDTLS_MD5_ALT */

/*
 * output = MD5( input buffer )
 */
int mbedtls_md5_ret(const unsigned char* input,
	size_t ilen,
	unsigned char output[16])
{
	int ret;
	mbedtls_md5_context ctx;

	mbedtls_md5_init(&ctx);

	if ((ret = mbedtls_md5_starts_ret(&ctx)) != 0)
		goto exit;

	if ((ret = mbedtls_md5_update_ret(&ctx, input, ilen)) != 0)
		goto exit;

	if ((ret = mbedtls_md5_finish_ret(&ctx, output)) != 0)
		goto exit;

exit:
	mbedtls_md5_free(&ctx);

	return (ret);
}

#if !defined(MBEDTLS_DEPRECATED_REMOVED)
void mbedtls_md5(const unsigned char* input,
	size_t ilen,
	unsigned char output[16])
{
	mbedtls_md5_ret(input, ilen, output);
}
#endif

#if defined(MBEDTLS_SELF_TEST)
/*
 * RFC 1321 test vectors
 */
static const unsigned char md5_test_buf[7][81] =
	{
		{""},
		{"a"},
		{"abc"},
		{"message digest"},
		{"abcdefghijklmnopqrstuvwxyz"},
		{"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"},
		{"12345678901234567890123456789012345678901234567890123456789012"
		 "345678901234567890"}};

static const size_t md5_test_buflen[7] =
	{
		0, 1, 3, 14, 26, 62, 80};

static const unsigned char md5_test_sum[7][16] =
	{
		{0xD4, 0x1D, 0x8C, 0xD9, 0x8F, 0x00, 0xB2, 0x04,
			0xE9, 0x80, 0x09, 0x98, 0xEC, 0xF8, 0x42, 0x7E},
		{0x0C, 0xC1, 0x75, 0xB9, 0xC0, 0xF1, 0xB6, 0xA8,
			0x31, 0xC3, 0x99, 0xE2, 0x69, 0x77, 0x26, 0x61},
		{0x90, 0x01, 0x50, 0x98, 0x3C, 0xD2, 0x4F, 0xB0,
			0xD6, 0x96, 0x3F, 0x7D, 0x28, 0xE1, 0x7F, 0x72},
		{0xF9, 0x6B, 0x69, 0x7D, 0x7C, 0xB7, 0x93, 0x8D,
			0x52, 0x5A, 0x2F, 0x31, 0xAA, 0xF1, 0x61, 0xD0},
		{0xC3, 0xFC, 0xD3, 0xD7, 0x61, 0x92, 0xE4, 0x00,
			0x7D, 0xFB, 0x49, 0x6C, 0xCA, 0x67, 0xE1, 0x3B},
		{0xD1, 0x74, 0xAB, 0x98, 0xD2, 0x77, 0xD9, 0xF5,
			0xA5, 0x61, 0x1C, 0x2C, 0x9F, 0x41, 0x9D, 0x9F},
		{0x57, 0xED, 0xF4, 0xA2, 0x2B, 0xE3, 0xC9, 0x55,
			0xAC, 0x49, 0xDA, 0x2E, 0x21, 0x07, 0xB6, 0x7A}};

/*
 * Checkup routine
 */
int mbedtls_md5_self_test(int verbose)
{
	int i, ret = 0;
	unsigned char md5sum[16];

	for (i = 0; i < 7; i++)
	{
		if (verbose != 0)
			mbedtls_printf("  MD5 test #%d: ", i + 1);

		ret = mbedtls_md5_ret(md5_test_buf[i], md5_test_buflen[i], md5sum);
		if (ret != 0)
			goto fail;

		if (memcmp(md5sum, md5_test_sum[i], 16) != 0)
		{
			ret = 1;
			goto fail;
		}

		if (verbose != 0)
			mbedtls_printf("passed\n");
	}

	if (verbose != 0)
		mbedtls_printf("\n");

	return (0);

fail:
	if (verbose != 0)
		mbedtls_printf("failed\n");

	return (ret);
}

#endif /* MBEDTLS_SELF_TEST */
